What happens during primary wastewater treatment? choose one: a. insoluble particles are removed by settling. b. microbes are added to oxidize organic compounds to carbon dioxide. c. the wastewater is pumped into drinking water reservoirs. d. the wastewater is chlorinated to eliminate pathogens.

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data

Will mark branliest. the theory of plate tectonics was developed with the contribution of scientists from many different disciplines. which of the following is a contribution from geophysicists?

What is used to keep track of the gamates and possible offsprings combination